[PATCH 1/2] spi: mtk-nor: Propagate errors from optional IRQ lookup

[phucduc.bui at gmail.com]

From: bui duc phuc <phucduc.bui at gmail.com>

platform_get_irq_optional() returns a positive IRQ number on success or
a negative error code on failure. For an optional IRQ, -ENXIO indicates
that no IRQ is available, while other errors should be propagated.

Propagate errors such as -EPROBE_DEFER and -EINVAL instead of continuing
probe without the IRQ.

Signed-off-by: bui duc phuc <phucduc.bui at gmail.com>
---
 drivers/spi/spi-mtk-nor.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
index 74f34537b02c..6b9a5d728549 100644
--- a/drivers/spi/spi-mtk-nor.c
+++ b/drivers/spi/spi-mtk-nor.c
@@ -895,6 +895,10 @@ static int mtk_nor_probe(struct platform_device *pdev)
 	irq = platform_get_irq_optional(pdev, 0);
 
 	if (irq < 0) {
+		if (irq != -ENXIO) {
+			ret = irq;
+			goto err_disable_clk;
+		}
 		dev_warn(sp->dev, "IRQ not available.");
 	} else {
 		ret = devm_request_irq(sp->dev, irq, mtk_nor_irq_handler, 0,
@@ -928,6 +932,7 @@ static int mtk_nor_probe(struct platform_device *pdev)
 	pm_runtime_set_suspended(&pdev->dev);
 	pm_runtime_dont_use_autosuspend(&pdev->dev);
 
+err_disable_clk:
 	mtk_nor_disable_clk(sp);
 
 	return ret;
-- 
2.43.0